diff --git a/basis/urls/encoding/encoding-docs.factor b/basis/urls/encoding/encoding-docs.factor
index f8b435441f..82ab3d1f69 100644
--- a/basis/urls/encoding/encoding-docs.factor
+++ b/basis/urls/encoding/encoding-docs.factor
@@ -7,7 +7,11 @@ HELP: url-decode
 
 HELP: url-encode
 { $values { "str" string } { "encoded" string } }
-{ $description "URL-encodes a string." } ;
+{ $description "URL-encodes a string, excluding certain characters, such as \"/\"." } ;
+
+HELP: url-encode-full
+{ $values { "str" string } { "encoded" string } }
+{ $description "URL-encodes a string, including all reserved characters, such as \"/\"." } ;
 
 HELP: url-quotable?
 { $values { "ch" "a character" } { "?" "a boolean" } }
diff --git a/basis/urls/encoding/encoding.factor b/basis/urls/encoding/encoding.factor
index fa882609a5..ce5bd044ac 100644
--- a/basis/urls/encoding/encoding.factor
+++ b/basis/urls/encoding/encoding.factor
@@ -14,6 +14,25 @@ IN: urls.encoding
         [ "/_-.:" member? ]
     } 1|| ; foldable
 
+! see http://tools.ietf.org/html/rfc3986#section-2.2
+: gen-delim? ( ch -- ? )
+    ":/?#[]@" member? ; foldable
+
+: sub-delim? ( ch -- ? )
+    "!$&'()*+,;=" member? ; foldable
+
+: reserved? ( ch -- ? )
+    [ gen-delim? ] [ sub-delim? ] bi or ; foldable
+
+! see http://tools.ietf.org/html/rfc3986#section-2.3
+: unreserved? ( ch -- ? )
+    {
+        [ letter? ]
+        [ LETTER? ]
+        [ digit? ]
+        [ "-._~" member? ]
+    } 1|| ; foldable
+
 <PRIVATE
 
 : push-utf8 ( ch -- )
@@ -27,6 +46,11 @@ PRIVATE>
         [ dup url-quotable? [ , ] [ push-utf8 ] if ] each
     ] "" make ;
 
+: url-encode-full ( str -- encoded )
+    [
+        [ dup unreserved? [ , ] [ push-utf8 ] if ] each
+    ] "" make ;
+
 <PRIVATE
 
 : url-decode-hex ( index str -- )